Question

As shown in figure, two pulses in a string having center to center distance of 8cm are travelling along mutually opposite direction. If the speed of both the pulse is 2cm/s, then after 2s, the energy of these pulses will be ………….. 

(A) zero 

(B) totally kinetic energy 

(C) totally potential energy 

(D) Partially potential energy and partially kinetic energy.

Answer 1

The correct option (B) totally kinetic energy

Explanation:

distance = velocity × time

∴ both particles will cover 2 × 2 = 4m

distance after 2 seconds. i.e.

The centre of both will super impose and potential energy will be zero

∴ Total energy will be in the form of kinetic energy.